# hello world
def main():
    print("in main function")

if __name__ == '__main__':
    main()

# 这是一条注释

# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
# mac new insert 
